1 /*-
2 * Copyright (c) 1999 Brian Scott Dean, brdean@unx.sas.com.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Jan-Simon Pendry under the following copyrights and conditions:
7 *
8 * Copyright (c) 1993 Jan-Simon Pendry
9 * Copyright (c) 1993
10 * The Regents of the University of California. All rights reserved.
11 *
12 * This code is derived from software contributed to Berkeley by
13 * Jan-Simon Pendry.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 3. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * $FreeBSD: src/sys/miscfs/procfs/procfs_dbregs.c,v 1.4.2.3 2002/01/22 17:22:59 nectar Exp $
40 */
41
42 #include <sys/param.h>
43 #include <sys/uio.h>
44 #include <sys/proc.h>
45 #include <sys/caps.h>
46 #include <sys/vnode.h>
47 #include <sys/reg.h>
48 #include <vfs/procfs/procfs.h>
49 #include <vm/vm.h>
50
51 int
procfs_dodbregs(struct proc * curp,struct lwp * lp,struct pfsnode * pfs,struct uio * uio)52 procfs_dodbregs(struct proc *curp, struct lwp *lp, struct pfsnode *pfs,
53 struct uio *uio)
54 {
55 struct proc *p = lp->lwp_proc;
56 int error;
57 struct dbreg r;
58
59 /* Can't trace a process that's currently exec'ing. */
60 if ((p->p_flags & P_INEXEC) != 0)
61 return EAGAIN;
62 if (!CHECKIO(curp, p) || p_trespass(curp->p_ucred, p->p_ucred))
63 return (EPERM);
64 LWPHOLD(lp);
65 error = procfs_read_dbregs(lp, &r);
66 if (error == 0)
67 error = uiomove_frombuf(&r, sizeof(r), uio);
68 if (error == 0 && uio->uio_rw == UIO_WRITE) {
69 if (lp->lwp_stat != LSSTOP)
70 error = EBUSY;
71 else
72 error = procfs_write_dbregs(lp, &r);
73 }
74 LWPRELE(lp);
75 uio->uio_offset = 0;
76
77 return (error);
78 }
79
80 int
procfs_validdbregs(struct lwp * lp)81 procfs_validdbregs(struct lwp *lp)
82 {
83 return ((lp->lwp_proc->p_flags & P_SYSTEM) == 0);
84 }
85